Friday, January 4, 2013

Data Center Basic, a brief

Today, ICT stand for Information and Communication Technology, for some people specially in big city in the world is basic needs. As we can see, the technology is growth so fast. Internet connection and telecommunication right now is never sleep. Start from my experience on 1995 my first experience browsing using modem 28 kbps, and today my internet connection in my house is 1 mbps, and the contents is vary from text or news become streaming. So that's why the rapid growth of data become exponential growth.
Data center is vital, from data center design, architecture, requirement etc, must be calculate.

A data center or computer centre (also datacenter) is a facility used to house computer systems and associated components, such as telecommunications and storage systems. It generally includes redundant or backup power supplies, redundant data communications connections, environmental controls (e.g., air conditioning, fire suppression) and security devices. 

http://en.wikipedia.org/wiki/Data_center 


Availability, in other word is no downtime, even planed or unplanned downtime.

Availability % Downtime per year Downtime per month* Downtime per week
90% ("one nine") 36.5 days 72 hours 16.8 hours
95% 18.25 days 36 hours 8.4 hours
97% 10.96 days 21.6 hours 5.04 hours
98% 7.30 days 14.4 hours 3.36 hours
99% ("two nines") 3.65 days 7.20 hours 1.68 hours
99.5% 1.83 days 3.60 hours 50.4 minutes
99.8% 17.52 hours 86.23 minutes 20.16 minutes
99.9% ("three nines") 8.76 hours 43.8 minutes 10.1 minutes
99.95% 4.38 hours 21.56 minutes 5.04 minutes
99.99% ("four nines") 52.56 minutes 4.32 minutes 1.01 minutes
99.999% ("five nines") 5.26 minutes 25.9 seconds 6.05 seconds
99.9999% ("six nines") 31.5 seconds 2.59 seconds 0.605 seconds
99.99999% ("seven nines") 3.15 seconds 0.259 seconds 0.0605 seconds

http://en.wikipedia.org/wiki/High_availability


As we can see above, total allowable downtime for planned and unplanned downtime. Base on the SLA/SR
In real life, the cause of downtime can several factors for example blackout power electricity, UPS failure, wrong calcutation, hardware failure, software bugs, human error/unskilled operator.

ICT  especially Enterprise/middle scale must be managed and organize correctly. Strategic, design, transition, operation and continual service improvement should be implement correctly (base on ITIL), YES it's not easy, but it doesn't mean impossible.


The calculation cause by downtime from "IT outage" impact to the lost of revenue.We can calculate base on this equation below.



Quantify Lost Revenue Costs

Revenue Cost = (Revenue / Annual Hours) X Impact X Outage Hours

Revenue = Gross annual revenue
Annual Hours = Total annual business hours
Impact = Percentage impact (e.g. % reduction in transactions or dollars during outage)
Outage Hours = Number of hours of outage






Quantify Lost Labor Costs

Labor Cost = People X Impact X Rate X Hours

People = Number of workers affected
Impact = Avg. % of work they could not perform
Rate = Average employee cost per hour
Hours = Number of hours of outage


http://www.firescope.com/QuickStart/Unify/Article.asp?ContentID=15

Well, even I work in mining company it's really different with retail or banking etc,  but I believe that calculation is close to the real cost.
































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